The glandulars used in Thyroid Complex are freeze-dried from clean, safe, disease-free, FDA- and USDA-certified manufacturing facilities, and the manufacturer ensures that the ingredients are Bovine Spongiform Encephalopathy (BSE) free and free from harmful chemicals or pesticides. The animals are bovine from Argentina and New Zealand, and they are in gelatin capsules from a BSE-free porcine source. Health of livestock used for food manufacturing in New Zealand is closely monitored by a world leading biosecurity system that is second to none, and is a global exemplar.